refactor: remove 473 lines of dead code across 5 SDK modules

- obligations: unused vendors state/fetch, unreachable filter==='ai' path
- tom: unused vendorControlsLoading state, unused bulkUpdateTOMs import
- loeschfristen: unused BASELINE_TEMPLATES imports, sdk hook, managingLegalHolds state
- vvt: unused apiGetCompleteness/apiGetLibrary, 7 unused VVTLib* interfaces
- vendor-compliance: 11 unused context methods, 6 unused selector hooks, ContractUploadData type

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

admin-compliance/app/sdk/loeschfristen/page.tsx

@@ -2,7 +2,6 @@
 
 import React, { useState, useEffect, useCallback, useMemo } from 'react'
 import { useRouter } from 'next/navigation'
-import { useSDK } from '@/lib/sdk'
 import { StepHeader, STEP_EXPLANATIONS } from '@/components/sdk/StepHeader'
 import {
   LoeschfristPolicy, LegalHold, StorageLocation,
@@ -15,7 +14,6 @@ import {
   formatRetentionDuration, isPolicyOverdue, getActiveLegalHolds,
   getEffectiveDeletionTrigger,
 } from '@/lib/sdk/loeschfristen-types'
-import { BASELINE_TEMPLATES, templateToPolicy, getTemplateById, getAllTemplateTags } from '@/lib/sdk/loeschfristen-baseline-catalog'
 import {
   PROFILING_STEPS, ProfilingAnswer, ProfilingStep,
   isStepComplete, getProfilingProgress, generatePoliciesFromProfile,
@@ -107,7 +105,6 @@ function TagInput({
 
 export default function LoeschfristenPage() {
   const router = useRouter()
-  const sdk = useSDK()
 
   // ---- Core state ----
   const [tab, setTab] = useState<Tab>('uebersicht')
@@ -127,9 +124,6 @@ export default function LoeschfristenPage() {
   // ---- Compliance state ----
   const [complianceResult, setComplianceResult] = useState<ComplianceCheckResult | null>(null)
 
-  // ---- Legal Hold management ----
-  const [managingLegalHolds, setManagingLegalHolds] = useState(false)
-
   // ---- Saving state ----
   const [saving, setSaving] = useState(false)